Parameter Merge.1-Key
val sexp_of_t : ('a -> Ppx_sexp_conv_lib.Sexp.t) -> 'a t -> Ppx_sexp_conv_lib.Sexp.t
val to_type_id : 'a t -> 'a Type_equal.Id.t
For correct behavior of the map,
to_type_id
must return the sameType_equal.Id
on different calls on the same input.